Modify Live Click Add Ons (Firefox)

Hello, For those of you who can modified firefox add ons, Live Click (Please download at here [login to view URL] ) Well, in general the function of this add ons is to check the latest update periodically of a blog (we can set the checking duration, please see attachment [login to view URL]) The only problem is, even though I set the duration = 2 minutes, the add ons doesn’t work that way. The add ons check the new update between a random time (sometime 10 mins, 16 mins). Like the one shown at [login to view URL] (see attachment). Can you modified the add ons so that If I set the duration = 2 minutes, it will check the new update 'exactly' every 2 minutes. And if this add ons detect the new update, it will give a warning alarm/sound. (I want to be able to use any mp3/mp4 file as a warning alarm) For those of you who want to bids on this project, please give me some examples of your previous work. Thanks. Keep in mind that I won't pay you unless you finish the job. Just bid this project if you think you are capable to do this project. Regards, Andrew